A computer network is a group of more computers connected to each electronically.
A computer network, often simply referred to as a network, is a collection of hardware components and computers interconnected by communication channels that allow sharing of resources and information.

Computers can be connected directly through a bi-directional cable or through an other piece of hardware called a hub.
A hub can also be used to connect two local area networks together to create a wide area network.
A hub can also be used to connect two local area networks together to create a wide area network.
Network elements
Servers : Servers are the computers that provide the shared resources to network users. There is usually only one server in a small network, but bigger networks may have more than one server.
Clients : Clients are the computers that can access the shared network resources provided by a server.
Media : The computers in a network are connected to each other by hardware components, such as cables. These components are called the media.
Shared data : A server provides shared resources and data over a network. The files that are provided by the server over the network are called shared data. This shared data can be a document, a worksheet or a folder.
Resources : Files, printers or other items that can be used by network users are known as resources. These resources can be either hardware or software resources.
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